C语言简单循环示例

# include <stdio.h>

int main(void)
{
  int i;
  int count = 0;
  int sum = 0;
  float avg;
  
  for (i=1; i<=100; i++)
  {
    if (i%2==0) 
    {
      count++;
      sum += i;
    }
  }

  avg = 1.0*sum / count;  // 1.0 默认为double类型
  
  printf("%d\n", count);
  printf("%d\n", sum);
  printf("%f\n", avg);
  
  return 0;
}

 

九九乘法表

# include <stdio.h>

int main(void)
{
  int i;
  int j;

  for (i=1; i<10; i++)
  {
    for (j=1; j<=i; j++)
    {
      printf("%d x %d = %d  ", i, j, i*j);  
    }
    printf("\n");

  }

  return 0;
}